1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "read_dex_file.h"
18
19 #include <fcntl.h>
20
21 #include <algorithm>
22 #include <iterator>
23 #include <string>
24 #include <utility>
25 #include <vector>
26
27 #include <android-base/logging.h>
28 #include <android-base/unique_fd.h>
29 #include <art_api/dex_file_support.h>
30
ReadSymbols(const std::vector<uint64_t> & dex_file_offsets,std::vector<DexFileSymbol> * symbols,const std::function<std::unique_ptr<art_api::dex::DexFile> (uint64_t offset)> & open_file_cb)31 static bool ReadSymbols(
32 const std::vector<uint64_t>& dex_file_offsets, std::vector<DexFileSymbol>* symbols,
33 const std::function<std::unique_ptr<art_api::dex::DexFile>(uint64_t offset)>& open_file_cb) {
34 for (uint64_t offset : dex_file_offsets) {
35 std::unique_ptr<art_api::dex::DexFile> dex_file = open_file_cb(offset);
36 if (dex_file == nullptr) {
37 return false;
38 }
39
40 std::vector<art_api::dex::MethodInfo> file_syms = dex_file->GetAllMethodInfos(false);
41
42 // Adjust offsets to be from the start of the combined file.
43 for (art_api::dex::MethodInfo& sym : file_syms) {
44 sym.offset += offset;
45 }
46
47 if (symbols->empty()) {
48 *symbols = std::move(file_syms);
49 } else {
50 symbols->reserve(symbols->size() + file_syms.size());
51 std::move(std::begin(file_syms), std::end(file_syms), std::back_inserter(*symbols));
52 }
53 }
54
55 return true;
56 }
57
ReadSymbolsFromDexFileInMemory(void * addr,uint64_t size,const std::vector<uint64_t> & dex_file_offsets,std::vector<DexFileSymbol> * symbols)58 bool ReadSymbolsFromDexFileInMemory(void* addr, uint64_t size,
59 const std::vector<uint64_t>& dex_file_offsets,
60 std::vector<DexFileSymbol>* symbols) {
61 return ReadSymbols(
62 dex_file_offsets, symbols, [&](uint64_t offset) -> std::unique_ptr<art_api::dex::DexFile> {
63 size_t max_file_size;
64 if (__builtin_sub_overflow(size, offset, &max_file_size)) {
65 return nullptr;
66 }
67 uint8_t* file_addr = static_cast<uint8_t*>(addr) + offset;
68 std::string error_msg;
69 std::unique_ptr<art_api::dex::DexFile> dex_file =
70 art_api::dex::DexFile::OpenFromMemory(file_addr, &max_file_size, "", &error_msg);
71 if (dex_file == nullptr) {
72 LOG(WARNING) << "Failed to read dex file symbols: " << error_msg;
73 return nullptr;
74 }
75 return dex_file;
76 });
77 }
78
ReadSymbolsFromDexFile(const std::string & file_path,const std::vector<uint64_t> & dex_file_offsets,std::vector<DexFileSymbol> * symbols)79 bool ReadSymbolsFromDexFile(const std::string& file_path,
80 const std::vector<uint64_t>& dex_file_offsets,
81 std::vector<DexFileSymbol>* symbols) {
82 android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_path.c_str(), O_RDONLY | O_CLOEXEC)));
83 if (fd == -1) {
84 return false;
85 }
86 return ReadSymbols(
87 dex_file_offsets, symbols, [&](uint64_t offset) -> std::unique_ptr<art_api::dex::DexFile> {
88 std::string error_msg;
89 std::unique_ptr<art_api::dex::DexFile> dex_file =
90 art_api::dex::DexFile::OpenFromFd(fd, offset, file_path, &error_msg);
91 if (dex_file == nullptr) {
92 LOG(WARNING) << "Failed to read dex file symbols from '" << file_path
93 << "': " << error_msg;
94 return nullptr;
95 }
96 return dex_file;
97 });
98 }
99